Key takeaways

  • Extended-release formulation: Tramadol comes in several forms. This version of tramadol is designed to release medication slowly over 24 hours, so it’s used for chronic pain that requires daily, around-the-clock management.
  • Strict dosage limits: To reduce the risk of serious side effects, the maximum daily dose is 300 mg. Taking more than prescribed or opening the capsule can lead to dangerous levels of tramadol in your system.
  • Interactions: Combining this medication with alcohol, benzodiazepines, or other CNS depressants can significantly increase the risk of life threatening breathing problems.

Tramadol hydrochloride extended-release capsules are the generic version of the brand-name medication ConZip. As an opioid pain reliever, tramadol is prescribed when other treatments wouldn’t be effective for long term, severe pain.

Because this is an extended-release (ER) medication, it works differently from fast-acting pain relievers. It’s intended to maintain a steady level of medication in your body throughout the day and night.

This slow, constant delivery helps avoid the “peaks and valleys” of pain relief often associated with immediate-release medications, but it also means the drug stays in your system much longer.

Note: Tramadol may come in other forms, including tablets, oral solutions, and injections. This article covers details for tramadol ER capsules, which may not apply to all forms of the drug.

Taking this medication correctly is vital for both its effectiveness and your safety. According to the prescribing information, tramadol ER capsules should be taken once every 24 hours at approximately the same time each day.

Available strengths

Tramadol ER capsules come in four strengths:

  • 100 milligrams (mg)
  • 200 mg
  • 300 mg

Your healthcare professional will determine the best starting dose for you based on your previous experience with pain medications and the severity of your condition.

Factors affecting your dosage

Not everyone starts on the same dose. Several factors can affect how a doctor determines the right strength for you:

  • Opioid tolerance: If you have been taking immediate-release opioids regularly, you may have a higher tolerance than someone who has not recently taken opioids. In this case, your doctor may start you at a higher strength than usual.
  • Kidney and liver function: Because the kidneys and liver are responsible for processing and clearing tramadol from your body, this extended-release formulation is not recommended if you have severe kidney or liver problems.
  • Age: Older adults (ages 65 years and older) may be more sensitive to the effects of opioids and may require more cautious dosing and monitoring.
  • Pain severity: The goal is to find the lowest effective dose for the shortest duration necessary to manage your chronic pain.

Dosing guidelines

  • Consistency: Capsules can be taken with or without food, but it’s best to choose one method and stick to it to help the drug absorb consistently. Switching back and forth can lead to fluctuating levels of the drug in your body.
  • How to take it: Tramadol capsules need to be swallowed whole. They should not be crushed, chewed, split, or dissolved. The capsule is designed to release the medication slowly over a 24-hour period. Breaking that barrier releases the entire dose at once, an effect known as “dose dumping,” which can lead to a dangerous overdose.
  • Maximum dosage: The maximum daily dose of tramadol ER is 300 mg. Under no circumstances should the total daily dose exceed 300 mg. Exceeding this limit significantly increases the risk of seizures and respiratory depression.

If you miss a dose, skip it and take your next dose at the regularly scheduled time. Do not “double up” to make up for a missed one, as this can lead to an overdose.

Note: Do not stop taking tramadol suddenly

If you have been taking tramadol regularly, your body has likely developed a physical dependence. Stopping “cold turkey” can lead to withdrawal symptoms such as anxiety, sweating, insomnia, tremors, intense pain, and increased risk of suicide.

Your prescriber will help you taper the dose gradually over several weeks to reduce the risk of withdrawal symptoms and other unwanted effects.

Like all medications that affect the central nervous system, tramadol can cause side effects. While many find these manageable, it is important to know what to watch for.

Common side effects

In clinical trials, the most frequently reported side effects (occurring in 5% or more of participants) included:

What are the worst side effects of tramadol?

While common side effects are usually mild to moderate, serious side effects are possible. The “worst” side effects of tramadol are medical emergencies that can become life threatening without treatment. These include:

Tramadol ER capsules have multiple boxed warnings. A boxed warning is the most serious type of warning from the Food and Drug Administration (FDA). It alerts doctors and patients about serious risks.

  • Addiction, abuse, and misuse: Like all opioids, tramadol carries a risk of addiction and misuse, which can lead to overdose and death. Even when taken exactly as directed, addiction is possible.
  • Life-threatening breathing problems: Serious, life threatening, or fatal respiratory depression is possible with tramadol. This risk is typically highest when starting the medication or following a dose increase.
  • Accidental ingestion: Unless prescribed, swallowing even one dose of tramadol can cause serious side effects or lead to a fatal overdose. It’s important to keep your tramadol prescription in a secure location where other people (especially children) cannot access it.
  • Neonatal opioid withdrawal syndrome (NOWS): Extended use during pregnancy can cause withdrawal symptoms in the newborn. Without treatment, this can be life threatening.
  • Interactions with drugs affecting cytochrome P450 isoenzymes: The way your body breaks down tramadol depends on specific enzymes. Taking other drugs that affect these enzymes can increase the risk of life threatening complications of tramadol or make the drug less effective.
  • Risks from concomitant use with benzodiazepines or other CNS depressants: Taking tramadol with alcohol, sedatives, or gabapentinoids can cause severe sedation, respiratory depression, coma, and death.
  • Ultra-rapid metabolism of tramadol: Some people have a genetic variation (CYP2D6 polymorphism) that causes them to break down tramadol much more slowly than usual. This can increase the risk of serious side effects, even at typical recommended doses of tramadol.

Due to these risks, tramadol is typically prescribed through a risk evaluation and mitigation strategy (REMS). The purpose of this program is to help educate prescribers on the safest treatment strategies with tramadol.

Before starting tramadol, it’s important to talk with your doctor about your health history. There are specific conditions where this medication may not be appropriate.

Who should not take tramadol?

Tramadol is contraindicated (not safe to take) if any of the following apply to you:

Drug interactions

Tramadol interacts with several types of drugs and other substances. These interactions may make tramadol less effective or increase the risk of serious side effects.

Before starting treatment, be sure to talk with your doctor know about all medications you’re taking, including:

  • if you are currently taking a monoamine oxidase inhibitors (MAOI) or have taken one within the last 14 days
  • if you take another central nervous system (CNS) depressant, including:
    • benzodiazepines, such as Xanax, Ativan, or Valium
    • gabapentinoids, such as gabapentin or pregabalin
  • CYP3A4 and CYP2D6 inhibitors, which includes some antibiotics, antifungals, and certian heart medications

With tramadol ER capsules (generic ConZip), you should take exactly one capsule per day. Because this is a 24-hour formulation designed to slowly release the medicine, taking more than one capsule in a single day is highly dangerous.

The absolute maximum dose of tramadol ER is 300 mg per day. Taking multiple capsules or exceeding this daily limit can cause severe side effects, including seizures, respiratory failure, or a life threatening overdose.

Whether 200 mg of tramadol is too much depends entirely on the formulation you are prescribed and your medical history:

  • For ER capsules: No, 200 mg is a standard mid-range daily dose. Extended-release capsules are available in 100 mg, 200 mg, and 300 mg strengths and are designed to release the drug gradually over 24 hours.
  • For immediate-release (IR) tablets: Yes, taking 200 mg all at once as a single dose of immediate-release tramadol is generally too much and exceeds standard starting doses.
  • Without a prescription: Taking any amount of tramadol that has not been specifically prescribed for you by a healthcare professional is dangerous and carries a high risk of side effects, addiction, and overdose.

Sleepiness and dizziness are common side effects of tramadol, especially at the start of treatment or after a dose increase.

Because it affects the central nervous system, your coordination and reaction times may be slowed. It’s recommended that you avoid driving, operating heavy machinery, or participating in dangerous activities until you are certain of how the medication may affect you.

In general, generic medications like tramadol ER capsules cost less than their brand-name counterparts, such as ConZip.

However, the actual price you pay can vary based on several factors, including:

  • the dosage you’re prescribed
  • the pharmacy you use
  • your insurance coverage

If you do not have health insurance, or if your plan does not cover this specific medication, a third-party savings program may help lower your out-of-pocket cost for tramadol.

Tramadol ER capsules (generic ConZip) offer a consistent, 24-hour approach to managing severe, chronic pain when other treatment options have proven insufficient. However, because it is an opioid medication, it’s important to be aware of the possible risks of treatment.

The best way to prevent serious side effects is to take the medication exactly as prescribed, and to keep your healthcare team informed about any changes to your medical history. If you visit a new doctor or pharmacist, be sure to let them know that you are taking an opioid medication to prevent accidental drug interactions.

Disclaimer: While Healthline strives for factual, comprehensive, and current information, this article is not a substitute for a licensed healthcare professional’s expertise. Always consult a doctor before taking or discontinuing any medication. Drug information is subject to change and may not cover all uses, directions, precautions, warnings, interactions, reactions, or adverse effects. The lack of a warning does not guarantee a drug’s safety, effectiveness, or appropriateness for all patients or specific uses. Learn more about our approach to content integrity.